Docker Machine is one of the new tools that Docker has released. It helps provision machines on a variety of cloud hosting providers and installs Docker with some basic security. The command line interface is pretty simple.
docker-machine create --driver digitalocean --digitalocean-access-token $DIGITALOCEAN_API_TOKEN machine_name
$DIGITALOCEAN_API_TOKEN is my access token and
machine_name is a random name for my machine. After waiting a minute or so, I can run one command and have an ElasticSearch instance using the Docker Hub ElasticSearch repository:
docker $(docker-machine config machine_name) run -d -p 9200:9200 elasticsearch